Enemies that are attracted to light sounds interesting to me (in fact, almost all ideas proposed sound interesting to me 
)
Moth that does not harm the player but eat away their clothes? I imagine that will make traveling with flashlight or headlight very dangerous, not in the tradition sense, but still dangerous nonetheless. I don’t really like the idea of your hard earned clothes (cargopants, backpack) can get destroyed by a few moths, you’ve got zombies to worry about.
Beside mere annoyance - in itself that’s not a bad idea, critter that’s annoying but harmless and add to the flavour of the game. But if we want to make mutated moth more than an annoyance, I suggest they can indirectly harm the player through their present, with that big of a size, those wings flapping must make some noise right? We can make a large enough mass of moths create noise and this noise may attract nearby zombies.
This can lead to interesting scenarios where a few moth flying close to the player wouldn’t be a problem, but when your flashlight attract a whole host of 'em you better be sure that will make some noise. You can turn off your light for a while and the moths will scatter, after that you can turn the light back on again.
Me too, not sure if that’s a common thing, but I tend to go on night raid mission without lights unless I’m still far from the city, upon getting close to the city, I will turn off the lights and navigate by minimap, walk close to the wall and try to hop from house to house (I left the windows open at day for this purpose).
